OUR

COMMON INSECTS.

A POPULAR ACCOUNT OF THE INSECTS

OF OUR

Fields, Forests, Gardens and Houses.

Illustrated with 4 Plates and 268 Woodcuts.

BY

A. S. PACKARD, Jr.,

Author of "A Guide To the Study of Insects."
SALEM
NATURALISTS' AGENCY.

Boston: Estes & Lauriat. New York: Dodd & Mead.
1873.

Entered, according to Act of Congress, in the year 1878, by
F. W. PUTNAM & CO.,
in the Office of the Librarian of Congress at Washington.

PRINTED AT
THE SALEM PRESS,
F. W. PUTNAM & CO.,
Proprietors.

CONTENTS

DEDICATION.

PREFACE.

This little volume mainly consists of a reprint of a series of essays which appeared in the "American Naturalist" (Vols. i-v, 1867-71). It is hoped that their perusal may lead to a better acquaintance with the habits and forms of our more common insects. The introduction was written expressly for this book, as well as Chapter XIII, "Hints on the Ancestry of Insects." The scientific reader may be drawn with greater interest to this chapter than to any other portion of the book. In this discussion of a perhaps abstruse and difficult theme, his indulgence is sought for whatever imperfections or deficiencies may appear. Our systems of classification may at least be tested by the application of the theory of evolution. The natural system, if we mistake not, is the genealogy of organized forms; when we can trace the latter, we establish the former. Considering how much naturalists differ in their views as to what is a natural classification, it is not strange that a genealogy of animals or plants seems absurd to many. To another generation of naturalists it must, perhaps, be left to decide whether to attempt the one is more unphilosophical than to attempt the other.

Most of the cuts have already appeared in the "Guide to the Study of Insects" and the "American Naturalist," where their original sources are given, while a few have been kindly contributed by Prof. A. E. Verrill, the Boston Society of Natural History, and Prof. C. V. Riley, and three are original.

Salem, June, 1873.

OUR COMMON INSECTS.

INTRODUCTORY.

1. Spider (Tegenaria).

What is an Insect? When we remember that the insects alone comprise four-fifths of the animal kingdom, and that there are upwards of 200,000 living species, it would seem a hopeless task to define what an insect is. But a common plan pervades the structure of them all. The bodies of all insects consist of a succession of rings, or segments, more or less hardened by the deposition of a chemical substance called chitine; these rings are arranged in three groups: the head, the thorax, or middle body, and the abdomen or hind body. In the six-footed insects, such as the bee, moth, beetle or dragon fly, four of these rings unite early in embryonic life to form the head; the thorax consists of three, as may be readily seen